<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo flask project</title>
</head>
<body>
<h1>Hello World</h1>
<h2>Hello World</h2>
<h3>Hello World</h3>
<h4>Hello World</h4>
<h5>Hello World</h5>
<img src="https://699pic.com/tupian-700818272.html?sid=101325"
      alt="" style="width: 500px;height: auto">
</body>
</html>